thunderkirby

11 Questions
11 Answers

+1

763

1

+87

function problem

The function f(x) is invertible, but the function g(x)=f(cx) is not invertible. Find the sum of all possible values of c.

thunderkirby Sep 29, 2019

0

1042

1

+87

rectangle and square in a square

A large square is divided into 4 small congruent rectangles and a small square as shown. The areas of the large and small squares are 25 and 7, respectively. What is the length of a diagonal of a small rectangle? read more ..

thunderkirby Jan 27, 2019

0

876

1

+87

Trig problem

In right triangle ABC, with angle a=90, we have AB=6 and BC=10. Find Cos A

thunderkirby Dec 11, 2018

+1

1100

2

+87

Length relating to centroid

in , the acute angles are and The centroid of Is G. If AB=1, What is AG?

thunderkirby Dec 8, 2018

+5

2061

3

+87

Geometry help plz!

In convex quadrilateral abcd,ab=bc=13 , cd=da=24, and . Points X andY are the midpoints of and respectively. Compute XY^2 (the square of the length of XY).

thunderkirby Nov 21, 2018

+1

1143

11

+87

Geometery help

These are two problems I am having trouble with. I don't know what went wrong with the latex so I am sorry.

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thunderkirby Sep 29, 2018

+3

1879

4

+87

Geometry question and inequality

Let line L1 be the graph of 5x+8y=-9 . Line L2 is perpendicular to line L1 and passes through the point (10,10) . If line L2 is the graph of the equation Y=mX+b , then find m+b I have a large truck and my neighbor has four read more ..

thunderkirby Aug 26, 2018

+1

940

2

+87

geometry problem help plz

Find a linear inequality with the following solution set. Each grid line represents one unit. https://latex.artofproblemsolving.com/b/d/c/bdc17544a660a2ede75d5c2642f86c2311ec1028.png
(Give your answer in "standard form" or where and are read more ..

thunderkirby Aug 25, 2018

+3

933

3

+87

I found this problem but it was unanswered so I will ask it again :P

A line segment is broken at two random points along its length. What is the probability that the three new segments can be arranged to form a triangle?
Please help and explain because I want to know how you solve this! Thanks

thunderkirby Aug 20, 2018

+1

977

4

+87

coordinate plane question

On the Cartesian plane, the midpoint between two points A(a,b) and B(c,d) is M(m,n). If is moved vertically upwards 8 units and horizontally to the right 2 units, and is moved vertically downwards 2 units and horizontally read more ..

thunderkirby Aug 19, 2018

+1

2200

6

+87

Confusing algebra

At the AoPS office, mice vary inversely with cats, that is,$\text{mice}=\frac{k}{\text{cats}}$ , for some value of K . When there are 3r-19 cats, there are2r+1 mice, and when there are 6r-27 mice, there arer-5 cats. Find K. read more ..

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thunderkirby Aug 10, 2018